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If p1a n d\ p2 are the lengths of te per...

If `p_1a n d\ p_2` are the lengths of te perpendiculars from the origin upon the lines `x\ s e ctheta+h y cos e ctheta=a\ a n d\ xcostheta-ysintheta=acos2theta` respectively, then `4p1 2+p2 2=a^2` b. `p1 2-4p2 2=a^2` c. `p1 2+p2 2=a^2` d. none of these

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